Now pick a corner to turn off the screen and make sure Put Display to Sleep is selected for it.

Tip: You can require one or more keys to be pressed while the mouse cursor is in the corner for the display to be turned off; hold down the desired key or keys (Command, Control, Option, Shift and any combination) while selecting the Put Display to Sleep from the corner action’s menu.

Hint: You can make more than one corner turn off the screen.

Click OK.

Now, to turn off the screen with a flick of the mouse cursor:

Move the mouse cursor to any corner configured to turn off your Mac’s screen.

Hint: If your hot corner requires a key to be pressed, you can let go of the key before releasing the mouse.

(How to turn off the screen on a Mac tested with macOS High Sierra 10.13; updated August 2018)

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